models: Fix invalid dates in patch mbox

Currently, the Date header in mbox views is incorrect;
datetime.datetime.utctimetuple assumes that the date is in the local
timezone, but we keep all dates as UTC.

This change replaces utctimetuple with a manual calculation of the
seconds-since-epoch timestamp, which email.utils.formatdate requires. We
add a testcase for this too.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

2 files changed, 28 insertions, 2 deletions

diff --git a/apps/patchwork/models.py b/apps/patchwork/models.py
index a9e70ce..250ad01 100644
--- a/apps/patchwork/models.py
+++ b/apps/patchwork/models.py
@@ -279,10 +279,12 @@ class Patch(models.Model):
         if self.content:
             body += '\n' + self.content
 
+        utc_timestamp = (self.date -
+                datetime.datetime.utcfromtimestamp(0)).total_seconds()
+
         mail = PatchMbox(body)
         mail['Subject'] = self.name
-        mail['Date'] = email.utils.formatdate(
-                        time.mktime(self.date.utctimetuple()))
+        mail['Date'] = email.utils.formatdate(utc_timestamp)
         mail['From'] = email.utils.formataddr((
                         str(Header(self.submitter.name, mail.patch_charset)),
                         self.submitter.email))
diff --git a/apps/patchwork/tests/mboxviews.py b/apps/patchwork/tests/mboxviews.py
index 07513c2..e619e7b 100644
--- a/apps/patchwork/tests/mboxviews.py
+++ b/apps/patchwork/tests/mboxviews.py
@@ -20,6 +20,8 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 import unittest
+import email
+import dateutil.parser, dateutil.tz
 from django.test import TestCase
 from django.test.client import Client
 from patchwork.models import Patch, Comment, Person
@@ -132,3 +134,25 @@ class MboxBrokenFromHeaderTest(TestCase):
 
         response = self.client.get('/patch/%d/mbox/' % self.patch.id)
         self.assertContains(response, from_email)
+
+class MboxDateHeaderTest(TestCase):
+    """ Test that the date provided in the patch mail view is correct """
+
+    def setUp(self):
+        defaults.project.save()
+        self.person = defaults.patch_author_person
+        self.person.save()
+
+        self.patch = Patch(project = defaults.project,
+                           msgid = 'p1', name = 'testpatch',
+                           submitter = self.person, content = '')
+        self.patch.save()
+
+    def testDateHeader(self):
+        response = self.client.get('/patch/%d/mbox/' % self.patch.id)
+        mail = email.message_from_string(response.content)
+        mail_date = dateutil.parser.parse(mail['Date'])
+        # patch dates are all in UTC
+        patch_date = self.patch.date.replace(tzinfo=dateutil.tz.tzutc(),
+                                            microsecond=0)
+        self.assertEqual(mail_date, patch_date)